Energy Cost Estimator

Calculation Method

The energy cost estimator calculates running costs using these steps:

1. Daily energy = wattage × hours per day ÷ 1000 (kWh)
2. Daily cost = daily energy × rate per kWh
3. Monthly cost = daily cost × 30 days
4. Yearly cost = daily cost × 365 days

Common Appliance Wattages

• LED light bulb: 8–15 W
• Incandescent bulb: 40–100 W
• Laptop: 30–70 W
• Desktop computer: 100–300 W
• Refrigerator: 100–200 W
• Air conditioner: 1000–3500 W
• Space heater: 1000–1500 W
• Washing machine: 400–600 W
• Electric oven: 2000–3000 W

Tips

• Check your electricity bill for the exact rate per kWh in your area
• Appliance wattage is typically listed on a label on the device
• Devices on standby still consume power (1–10 W typically)
• Energy-efficient appliances can significantly reduce annual costs

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